How Do You Respond?

If any of you have watched and of Dr. Craig's debates you will be familiar with one of his arguments:
"God is the best explainstion of the applicability of math to the physical world --> god created the universe with the mathematical structure he had in mind
1.) If god did not exist then applicability of math would be a happy coincidence
2.) The applicability of math is not a happy coincidence
3.) THEREFORE: god exists"